In this fascinating and very long thread, I see a lot of discussion about larger band sizes coming with larger cups despite being labeled as A or B or so forth. It's true. A 38B fits me perfectly, except that the band is too tight. Since it's elastic, I can close it, but there's that underarm bulge (and I'm slender). I've tried 40B bras, but the cups don't fit the same.
The solution is simple: band extenders. Find these at a JoAnn or similar sewing-and-crafts store in an assortment of colors and hook arrays (single, double, etc.) for a pittance. They have a row of hooks on one end and several rows of eyes. Just put the hooks of your bra into any set of eyes and hook the extender's hooks to your bra's eyes. Too tight? Go to the next row of eyes. They don't always have the exact vertical spacing between hooks and eyes as your bra does, but they're close enough.
The cool thing is that bras naturally stretch with wear. Over time, you'll probably go to the next-tighter set of eyes. If you're really in luck, you can eventually ditch the extender without the bulge. Those we call broken-in, like your most favorite, totally comfortable pair of shoes. I've sewn extenders in to make them more permanent, but the temporary attachment works just fine.
As one with actual B-cup boobs (not pointy pectorals) from past medical treatment, I insist that my bras feel comfortable and look natural. This does it for me. I'm currently breaking in a new Bali (first time with that brand) "Passion for Comfort" 38B that has just perfect cups. I moved the extender to the next row of eyes yesterday. Oh, my, almost the Cadillac bumper-guard look.
